Operating Systems - Old Questions

1. Suppose that a disk has 100 cylinders, numbered 0 to 99. The drive is currently serving a request at cylinder 45. The queue of pending requests, in FIFO order is: 88, 72, 13, 74, 48, 9, 22, 50, 35, and 30. What is the total distance (in cylinders) that the disk arm moves to satisfy all pending requests for each of the following disk scheduling algorithms?
(a) FCFS
(b) SCAN
(c) SSTF [10]